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. C. E. MILLER.

ARCH BRICK. APPLICATIONFILED APR-14, 1919.

1,320,082. Patenmd 001;. 28, 1919.

UNITED s A Es PATENT oEEIcE.

CHARLES E. MILLE or CHICAGO, I'Lmnois, Assrenon TO UNIvEnsAL ARCHCOMPANY, OF CHICAGO, ILLINOIS, AconroRATIoN OF ILLINOIS.

ARCH-BRICK.

To all whom it may concern:

Be it known that I, CHARLES E. MILLE a. citizen of the United States,and resident of Chicago, in the county of Cook and'Stat'e of Illinois,have invented certain new and useful Improvements in. Arch-Brick, ofwhich the following is a specification. I

My invention relates to walls or baflies for furnaces and particularlyto a novel brick construction adapted for use in a vertical baflie wallprimarily intended for use in locomotives. a 1

One of the objects of my invention is to provide a brick constructionadapted to in-' terlock with a duplicate brick in order to forma wallthe elements of which are inter locked against lateral separation. Thedesired result is secured by constructing bricks of generally T-shape inplan view, the abutting edges of adjacent bricks being 'di-agonallydisposed with relation'to the transverse axis of the wall, the taper ofthe sides of the brick at both the small andthe largeends being in thesame direction, that is, thesides of the small end of the brick convergetoward the body and the sides of the large end converge toward a pointaway from the body. In walls of the character under consideration aseries of'air ducts are provided, these ducts in the present case beingconstituted by metal tubes rigidly held at their upper and lowerextremities and serving to assist in retaining the bricks in place. Thebricks are of duplicate construction and when alternate bricks areturned 180 and placed in end-to-end relation a tubeis accommodated inthe space at the ends of the mating bricks and they are securely held inplace against movement in onedirection by the interlocking effect and inanother direction by engagement with a tube.

The invention will be more readily under stood by reference to theaccompanying drawings, wherein:

Figure l is a horizontal sectional view of a wall constructed inaccordance with my invention, the bricks composing the wall being Ishown in plan view.

Fig. 2 is a vertical sectional'view on the line 2-2 of Fig. 1; and VFig. 3 is a sectional view through one of the bricks.

It will be understood that a wall such as contemplated by me is intendedfor use in locomotives and is known as the Gaines type.

Specification of Letters Patent.

Patented Oct. 28, 1919.

Application filed ,Apri1"14, 1319. Serial No.289,955

In this construction air is admitted through the bottom of the fire boxand delivered by means of tubes or passages to the furnace at a pointabove the fuel bed. In view of the tremendous strain and wear to whichsuch walls are subjected it has been found difiicult to maintain themfor any considerable length of time. By reason of my arrangement thebricks composing thewall have greater stability and cannot readilybecome displaced. I

i The wall iscomposed of a plurality of whole bricks 10- and half bricks11,a number being employed suflicient to bridge the space between theside sheets9 of the boiler. Air is supplied to the fire box by means oftubes 12 ,or similar passage ways, the tubes being bent at right anglesat their upper ends as shown in Fig. 2, in order to discharge the air ata. point abovethe fuelbed andan chored in a top course of bricks. Thebricks composing the wall serve a double purpose 'ofproviding abaflleand protecting the air supplying tubes. To that end the bricks areformed of generally T-shape in plan view, the construction being suchthat when two duplicate bricks are placed end to end a space 13 is leftfor a tube 12. The engaging surfaces of both the small and large ends ofthe brick are tapered, the taper 1a of the small end corresponding tothe taper 15 of the large end. The inclines are such that when thebricks are associated as shown in Fig.1, and the ends are held as byabutment against the side sheet of the boiler, the bricks cannot bemoved laterally but are interlocked and can only be separated bymovement vertically. This result is secured by tapering both the smalland the large ends of the brick and by cooperation with the tubes 12.Because of the tapered ends alternate bricks are prevented from movementin opposite directions away from each other. They are prevented frommovement in the opposite directions by contact first with the tubes,and, secondin the absence of the tubes with the large end of the matingbricks. It is understood, of course, that it is necessary in order tosecure the effect described, to firmly hold the end bricks in order thatthe bricks may not separate longitudinally of the wall- A p The endbricks 11 are usually formed with fiat ends in order to properlycooperate with the side sheet, the end adapted to cooperate may bevaried somewhat Without departure from the spirit or my inventlon and Ido with a full size brick being the same as that heretofore described.The bricks will preferably be lightened by providing recesses 16 in onesurface'thereot' and this practice will also be followed in the halfbricks 11, in which case a half recess 17 will be formed.

Obviouslythe exact form of the bricks not wish to be limited except asindicated bythe appended claims.

I claim:

'1. In a vertical wall construction for fire boxes, the combination of aplurality of bricks adapted to be placed in end to end relation and toprovide a vertical passage at their junction, said bricks beinggenerally T-shaped in plan view, the abutting surfaces of adjacentbricks being angularly disposed with relation to the transverse axis ofthe wall, and adjacent bricks being positioned to overlap and interlock,and means for retaining thebricks against longitudinal separation,substantially as described.

2. A vertical baflie-wall brick of T-shape in plan view, the side edgesof the head being adapted to cooperate with the side edges of the footof a duplicate brick in order to hold the bricks against lateralseparation in one direction, both the head and foot being wedge-shapedin plan view, a plurality of said bricks being adapted to be associatedin end to end relation and to .be held in interlockedposition,substantially as described.

3. A vertical bafiie-wall-brick of T-shape in plan View, the sidesbetween the head and foot being recessed to provide for a duct, the headand foot portions being wedge-shaped in plan View, the sides of the footportion converging toward the head and the sides of the head having thesame inclination, a plurality of said bricks being adapted to be associated in end to end relation and to be held in interlocked position,substantially as described. V

4. In a vertical bafiie-wall, the combination of bricks of T-shape inplan view, providing a vertical passage at the junction of adjacentbricks, and a tube in said passage, the two ends of said bricks beingwedgeshaped in plan view, mating bricks being interlocked againstlateral movement in one direction by reason of said wedge-shaped endsand held against movement in the opposite direction by engagement withsaid tube, substantially as described.

Signed at Chicago, this 11th day of April, 1919.

CHARLES E. MILLER.

WVitness T. D. BUTLER.

Copies of this patent may be obtained for. five cents each, byaddressing the Commissioner of Patents,

Washington, D. C. i

